NEMA Standard for PTFE Insulated Wire¹:

HP3-(Type) (Construction)(Conductor Material) (AWG)(Number of Strands)(Color)
NEMA Type: ET, E, EE as described above.
Construction: Wrapped (W), Extruded (X)

Example: HP3-EXCFE9
PTFE, Type E, Extruded, Nickel Plated Copper, 22 AWG, 19 Strands, White

NEMA Standard for FEP Insulated Wire²:

HP4-(Type)(Conductor Material)(AWG)(Number of Strands)(Color)
NEMA Type: KT, K, KK as described above.

Example: HP4-K-BFA9
FEP, Type K, Silver Plated Copper, 22 AWG, Solid, White

Part Number Identification

Conductor Material and Coating

Letter	Conductor Material and Coating
B	Silver Plated Copper (SPC)
C	Nickel Plated Copper
D	Silver Plated High Strength Copper Alloy (SPC Alloy)
E	Nickel Plated High Strength Copper Alloy (NPC Alloy)
F	Silver Plated Copper Clad Steel (SPCCS)
G	Nickel Plated Copper Clad Steel (NPCCS)
H	Tin Plated Copper (TPC) (HP4 only, not for HP3)

AWG Nominal Conductor Size

AWG	Letter	AWG	Letter	AWG	Letter	AWG	Letter
32	A	20	G	8	N	-	-
30	B	18	H	6	P	-	-
28	C	16	J	4	R	2/0	W
26	D	14	K	2	S	3/0	Y
24	E	12	L	1	T	4/0	Z
22	F	10	M	1/0	U	-	-

Number of Strands

Letter	Number of Strands
A	1
B	7
E	19
G	37
L	133
P	665
R	817
S	1045
T	1330
V	1665
W	2109

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NOTES

¹ NEMA HP3-2012
² NEMA HP4-2012
NEMA is the National Electrical Manufacturers Association